Changing The Pre-Pressure Of The Expansion Vessel - Daikin Altherma 3 R F Installer's Reference Manual

6 | Preparation

6.4.4 Changing the pre-pressure of the expansion vessel

Installer reference guide
60
Installation
height
(a)
difference
≤7 m No pre-pressure adjustment is
required.
>7 m Do the following:
▪ Increase the pre-pressure
according to the required
installation
difference. The pre-pressure
should increase by 0.1 bar
for each metre above 7 m.
▪ Check if the water volume
does
maximum
volume.
(a)
This is the height difference (m) between the highest point of the water circuit and the
indoor unit. If the indoor unit is at the highest point of the installation, the installation
height is 0 m.
Minimum flow rate
Check that the minimum flow rate in the installation is guaranteed in all conditions.
This minimum flow rate is required during defrost/backup heater operation. For
this purpose, use the overpressure bypass valve delivered with the unit.
NOTICE
When circulation in each or certain space heating loops is controlled by remotely
controlled valves, it is important that the minimum flow rate is guaranteed, even if all
valves are closed. In case the minimum flow rate cannot be reached, a flow error 7H
will be generated (no heating or operation).
Minimum required flow rate
12 l/min
See the recommended procedure as described in
4
commissioning" [ 181].
NOTICE
Only a licensed installer may adjust the pre-pressure of the expansion vessel.
Water volume
≤200 l
Do the following:
▪
▪
The expansion vessel of the
indoor unit is too small for the
installation. In this case, it is
recommended to install an
height
extra vessel outside the unit.
NOT exceed the
allowed water
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA/DJ3V+6V+9W7
>200 l
Decrease the pre-pressure
according to the required
installation
difference. The pre-pressure
should decrease by 0.1 bar
for each metre below 7 m.
Check if the water volume
does NOT exceed
maximum allowed
volume.
"9.4 Checklist during
Daikin Altherma 3 R F
4P618947-1 – 2020.03
height
the
water